Rotary bolt



(No Model.)

w. D. WATROUS.

ROTARY BOLT.

No. 248,242. Patented 001;. 11,1881.

22 ea sees,

UNITED STATES PATENT OFFICE.

WILLIAM D. WATROUS, OF CEDAR RAPIDS, IOWA.

ROTARY BOLT.

SPECIFICATION forming part of Letters Patent No. 248,242, dated October 11, 1881.

Application filedApril 13, 1881. (No model.)

' To all whom it may concern:

Be it known that I, WILLIAMD. WATROUS, of Cedar Rapids, in the county of Linn, and in the State of Iowa, have invented certain new and useful Improvements in Boning-Screens; and

I do hereby declare that the followingis afull,

clear, and exact description thereof, reference beinghad to the accompanying drawings, and to the letters of reference marked thereon, making a part of this specification.

My invention relates to certain novel improvements in bolting-screens, which will be understood from the following description and the annexed drawings, in which latter- Figure 1 represents an end view of my improved bolting-reel. Fig.2 represents a longitudinal vertical section of the reel with a portion of the bolting-cloth removed. Fig. 3 represents an end view of a screen constructed with curved sides. Fig. 4 represents a view of one of the sections composing the frame of my improved reel.

The letter A indicates the central longitudinal shaft of the reel, which is journaledin suitable bearings in the frame of the apparatus. The letter 13 indicates aseries of radial arms secured to the sh aftA, and supporting the screen-section s O. The said sections are curved, as indicated in Figs. 1, 3, and 4, and are joined at their longitudinal. edges, as shown.

The letter D indicates the bolting-cloth,

which is of the ordinary description, and is secured to the inner sides of the screen-sections in any convenient manner. The sections are confined to the arms by means of the wedges E,which pass through suitable slots in the arms, the arms being shouldered, as indicated by the letter F, to form seats for the sections.

In Figs. 1 and .2 ofthe drawings the screen is represented as constructed with double walls of bolting-sections, which are arranged with respect to each other as indicated in Fig. 1, the inner sections being secured to the arms by means of the slotted clamps G and wedges. The inner screen extends from near the front end of the outer screen and projects ashort distance beyond its rear, so that the contents of the two may discharge into separate receptacles.

The letter I indicates a feed-hopper, which extends into the forward end of the reel at its center. The hopper is divided into two compartments, K L, by means of a partition, M, and a collar, N, the latter being secured to the shaft and rotating with it. The forward compartment leads into the outer reel by means of a chute, O, and the other into the inner reel directly.

The letter P indicates a series of conveyerblades secured to the shaft, to carry the material into the respective reels.

The tailin gs or bran pass off at the rear end of the reel in the usual manner.

The flour may he rebolted in the outer reel while the initial bolting is going on in the inner one, thus condensing in one machine the operations which previously required several.

The screens being made in sections, it is evident that any grade of bolting-cloth from the coarsest to the-finest may be readily employed by simply changing the sections, and that by thus changing them repairs can be conveniently made.

The screen as thus constructed will, owing to the curvature of the sides, cause the middlings to lie close to the sides, as indicated in Fig. 3, and not be thrown OK as the screen rotates, as in the ordinary method of construction.

By the arrangement of the inner curved screen-sections so that their angles of meeting in the bolt-frame lie between the angles of meeting of the outer screen-sections, as shown in Fig. 1, the material which. passes through the inner screen will fall upon the broad concave surfaces of the outer screen-sections, between the angles thereof. Consequently the material will not be liable to clog in the angles'of the outer screen,but will be distributed nearly uniformly over the surfaces thereof, and amore equable screening action will result. For this reason I consider my arrangement of the two screens, when formed of concave sections, a valuable improvement in bolts.

I am aware that bolts have been constructed of cylindrical form, having sections covered in- 9 5 section my bolt is quadrangular and notcylindrical, and that it is formed of four remova ble frames or sections of a concavo convex form, which are eccentric to the axis of the shaft A when they are confinedin their places. By this form of bolt I combine all the advantages of the well-known square or hexagonal bolts, with the advantages of having the concave bolting-surfaces.

Having thusfully described my invention, whatIclaim, and desire to secure by Letters Patent, is-

1. In combination with the feed-hopper leading to the two screens, thepartition locatedin said hopper, the shaft and its collar, and the conveyer-blades on the shaft, the Whole arranged to operate substantially as described.

2; A quadrangular bolting-reel having a series of removable and interchangeable con- 

